/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.gaia.translation.functions;



import com.bff.gaia.unified.sdk.transforms.windowing.BoundedWindow;

import com.bff.gaia.unified.sdk.transforms.windowing.WindowFn;

import com.bff.gaia.unified.sdk.util.WindowedValue;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.Iterables;

import org.joda.time.Instant;



/** {@link WindowFn.AssignContext} for Gaia functions. */

class GaiaAssignContext<InputT, W extends BoundedWindow>

    extends WindowFn<InputT, W>.AssignContext {

  private final WindowedValue<InputT> value;



  GaiaAssignContext(WindowFn<InputT, W> fn, WindowedValue<InputT> value) {

    fn.super();

    if (Iterables.size(value.getWindows()) != 1) {

      throw new IllegalArgumentException(

          String.format(

              "%s passed to window assignment must be in a single window, but it was in %s: %s",

              WindowedValue.class.getSimpleName(),

              Iterables.size(value.getWindows()),

              value.getWindows()));

    }

    this.value = value;

  }



  @Override

  public InputT element() {

    return value.getValue();

  }



  @Override

  public Instant timestamp() {

    return value.getTimestamp();

  }



  @Override

  public BoundedWindow window() {

    return Iterables.getOnlyElement(value.getWindows());

  }

}